JPH04274023A - Production of magnetic recording medium - Google Patents
Production of magnetic recording mediumInfo
- Publication number
- JPH04274023A JPH04274023A JP11709391A JP11709391A JPH04274023A JP H04274023 A JPH04274023 A JP H04274023A JP 11709391 A JP11709391 A JP 11709391A JP 11709391 A JP11709391 A JP 11709391A JP H04274023 A JPH04274023 A JP H04274023A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- magnetic layer
- roll
- magnet
- recording medium
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 230000005291 magnetic effect Effects 0.000 title claims abstract description 66
- 238000004519 manufacturing process Methods 0.000 title claims description 6
- 238000000034 method Methods 0.000 claims description 9
- 238000000227 grinding Methods 0.000 claims description 8
- 239000000843 powder Substances 0.000 abstract description 6
- 230000005389 magnetism Effects 0.000 abstract description 2
- 239000006247 magnetic powder Substances 0.000 description 11
- 239000002245 particle Substances 0.000 description 10
- 229920001577 copolymer Polymers 0.000 description 9
- 229920005989 resin Polymers 0.000 description 8
- 239000011347 resin Substances 0.000 description 8
- 239000011230 binding agent Substances 0.000 description 6
- 239000000203 mixture Substances 0.000 description 5
- 239000003973 paint Substances 0.000 description 5
- 239000004744 fabric Substances 0.000 description 4
- SZVJSHCCFOBDDC-UHFFFAOYSA-N ferrosoferric oxide Chemical compound O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 4
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 4
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 3
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 229920001807 Urea-formaldehyde Polymers 0.000 description 3
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 3
- AYTAKQFHWFYBMA-UHFFFAOYSA-N chromium dioxide Chemical compound O=[Cr]=O AYTAKQFHWFYBMA-UHFFFAOYSA-N 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- -1 polyethylene terephthalate Polymers 0.000 description 3
- 229910052594 sapphire Inorganic materials 0.000 description 3
- 239000010980 sapphire Substances 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- 229920002799 BoPET Polymers 0.000 description 2
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 2
- 229920000877 Melamine resin Polymers 0.000 description 2
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 description 2
- 229920002433 Vinyl chloride-vinyl acetate copolymer Polymers 0.000 description 2
- 238000003490 calendering Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910003460 diamond Inorganic materials 0.000 description 2
- 239000010432 diamond Substances 0.000 description 2
- 230000005294 ferromagnetic effect Effects 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 239000012948 isocyanate Substances 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- 229920006122 polyamide resin Polymers 0.000 description 2
- 229920001225 polyester resin Polymers 0.000 description 2
- 239000004645 polyester resin Substances 0.000 description 2
- 229920000139 polyethylene terephthalate Polymers 0.000 description 2
- 239000005020 polyethylene terephthalate Substances 0.000 description 2
- 229920005749 polyurethane resin Polymers 0.000 description 2
- 229920001187 thermosetting polymer Polymers 0.000 description 2
- 229910006297 γ-Fe2O3 Inorganic materials 0.000 description 2
- QMMJWQMCMRUYTG-UHFFFAOYSA-N 1,2,4,5-tetrachloro-3-(trifluoromethyl)benzene Chemical compound FC(F)(F)C1=C(Cl)C(Cl)=CC(Cl)=C1Cl QMMJWQMCMRUYTG-UHFFFAOYSA-N 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- 239000004640 Melamine resin Substances 0.000 description 1
- 229920000459 Nitrile rubber Polymers 0.000 description 1
- 239000000020 Nitrocellulose Substances 0.000 description 1
- 239000005062 Polybutadiene Substances 0.000 description 1
- 235000021355 Stearic acid Nutrition 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- GZCGUPFRVQAUEE-SLPGGIOYSA-N aldehydo-D-glucose Chemical compound OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C=O GZCGUPFRVQAUEE-SLPGGIOYSA-N 0.000 description 1
- 229920000180 alkyd Polymers 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- FHTACFVZIAVFCY-UHFFFAOYSA-N buta-1,3-diene;2-methylprop-2-enoic acid;prop-2-enenitrile Chemical compound C=CC=C.C=CC#N.CC(=C)C(O)=O FHTACFVZIAVFCY-UHFFFAOYSA-N 0.000 description 1
- NTXGQCSETZTARF-UHFFFAOYSA-N buta-1,3-diene;prop-2-enenitrile Chemical compound C=CC=C.C=CC#N NTXGQCSETZTARF-UHFFFAOYSA-N 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- HGAZMNJKRQFZKS-UHFFFAOYSA-N chloroethene;ethenyl acetate Chemical compound ClC=C.CC(=O)OC=C HGAZMNJKRQFZKS-UHFFFAOYSA-N 0.000 description 1
- 229940090961 chromium dioxide Drugs 0.000 description 1
- IAQWMWUKBQPOIY-UHFFFAOYSA-N chromium(4+);oxygen(2-) Chemical compound [O-2].[O-2].[Cr+4] IAQWMWUKBQPOIY-UHFFFAOYSA-N 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 150000002009 diols Chemical class 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 230000000855 fungicidal effect Effects 0.000 description 1
- 239000000417 fungicide Substances 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- LNEPOXFFQSENCJ-UHFFFAOYSA-N haloperidol Chemical compound C1CC(O)(C=2C=CC(Cl)=CC=2)CCN1CCCC(=O)C1=CC=C(F)C=C1 LNEPOXFFQSENCJ-UHFFFAOYSA-N 0.000 description 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
- YOBAEOGBNPPUQV-UHFFFAOYSA-N iron;trihydrate Chemical compound O.O.O.[Fe].[Fe] YOBAEOGBNPPUQV-UHFFFAOYSA-N 0.000 description 1
- 150000002513 isocyanates Chemical class 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229920003145 methacrylic acid copolymer Polymers 0.000 description 1
- 229940117841 methacrylic acid copolymer Drugs 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 229920001220 nitrocellulos Polymers 0.000 description 1
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 1
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 229920001568 phenolic resin Polymers 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 229920002037 poly(vinyl butyral) polymer Polymers 0.000 description 1
- 229920000768 polyamine Polymers 0.000 description 1
- 229920002857 polybutadiene Polymers 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920005906 polyester polyol Polymers 0.000 description 1
- 229920001228 polyisocyanate Polymers 0.000 description 1
- 239000005056 polyisocyanate Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920002620 polyvinyl fluoride Polymers 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 229920002050 silicone resin Polymers 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000008117 stearic acid Substances 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229920003051 synthetic elastomer Polymers 0.000 description 1
- 239000005061 synthetic rubber Substances 0.000 description 1
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 1
- AAAQKTZKLRYKHR-UHFFFAOYSA-N triphenylmethane Chemical compound C1=CC=CC=C1C(C=1C=CC=CC=1)C1=CC=CC=C1 AAAQKTZKLRYKHR-UHFFFAOYSA-N 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
Landscapes
- Manufacturing Of Magnetic Record Carriers (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は、磁性層表面の粉落ち等
を改善した磁気記録媒体の製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a magnetic recording medium in which dust removal on the surface of a magnetic layer is improved.
【０００２】0002
【従来の技術】磁気テープ、磁気ディスク等の磁気記録
媒体はビデオ分野、オーディオ分野、コンピュータ分野
等で広く使用されている。2. Description of the Related Art Magnetic recording media such as magnetic tapes and magnetic disks are widely used in the video field, audio field, computer field, etc.
【０００３】例えば磁気テープは磁気テープカセットと
しても多く用いられているが、この磁気テープカセット
をビデオデッキに装着して記録や再生を行なうと、磁気
ヘッドと磁気テープの相対的摺動作用により磁気テープ
から磁性層の磁性粉末、バインダー等の一部が剥落する
、いわゆる粉落ちを生じたり、磁性層表面に付着した付
着物が脱落することがあり、これら脱落物がヘッドの目
詰まり等を引き起こすことがある。この粉落ちは、ドロ
ップアウトの発生原因になることがあるのみならず、磁
性層表面の強磁性粉末が減少するので出力低下等の電磁
変換特性を悪くするという問題も生じる。For example, magnetic tape is often used as a magnetic tape cassette, but when this magnetic tape cassette is attached to a video deck for recording or playback, the magnetic tape is Part of the magnetic powder, binder, etc. in the magnetic layer may flake off from the tape, or so-called powder drop, or deposits attached to the surface of the magnetic layer may fall off, and these debris may cause head clogging, etc. Sometimes. This falling powder may not only cause dropout, but also cause problems such as deterioration of electromagnetic characteristics such as a decrease in output because the amount of ferromagnetic powder on the surface of the magnetic layer is reduced.
【０００４】このような磁気テープ等の磁気記録媒体に
は、磁性粉末、バインダー、溶剤、その他の添加剤から
なる磁性塗料を支持体に塗布・乾燥し、磁性塗膜を形成
した塗布型の磁気記録媒体が多く使用されているが、磁
性層表面には固着力の小さい磁性粉末、バインダー等の
粒子や、付着物が存在し、これらが擦られるときに剥落
し易く、これが上記したヘッドの目詰まり等を起こし易
くする。特に直接出力の低下を引き起こすのは磁性粉を
含有するバインダーの剥落であることがわかっている。[0004] Magnetic recording media such as magnetic tapes are coated with magnetic coatings consisting of magnetic powder, binder, solvent, and other additives, which are coated on a support and dried to form a magnetic coating. Many recording media are used, but the surface of the magnetic layer contains particles such as magnetic powder and binder with low adhesion, as well as deposits, which tend to peel off when rubbed. Makes it easier to get clogged. In particular, it has been found that flaking of the binder containing magnetic powder directly causes a decrease in output.
【０００５】そこで、この磁性層表面の固着力の小さい
粒子や、付着物を予め取り除こうとして、磁性層表面を
ダイヤモンドホイールあるいは固定式のサファイヤブレ
ードなどの高硬度の研削具を用いて研削し、磁性層表面
からの脱落物の量を低減することも提案されている。[0005] Therefore, in order to remove particles with a small adhesion force and deposits on the surface of the magnetic layer, the surface of the magnetic layer is ground using a high-hardness grinding tool such as a diamond wheel or a fixed sapphire blade. It has also been proposed to reduce the amount of debris falling from the surface of the magnetic layer.
【０００６】[0006]
【発明が解決しようとする課題】しかしながら、この磁
性表面を研削する方法によっても、粉落ち等の脱落物の
量を十分に低減することができず、その改善が望まれて
いた。本発明の目的は、磁性層表面の脱落し易い物を十
分に除去することにある。However, even with this method of grinding the magnetic surface, it is not possible to sufficiently reduce the amount of fallen particles such as powder particles, and an improvement has been desired. An object of the present invention is to sufficiently remove substances that easily fall off from the surface of the magnetic layer.
【０００７】[0007]
【課題を解決するための手段】本発明は、上記課題を解
決するために、支持体上に磁性層を形成し、この磁性層
表面を研削し、この研削した磁性表面に磁石体を接触又
は近接させる磁気記録媒体の製造方法を提供するもので
ある。この際磁石体は磁石ロールであることが好ましい
。[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention forms a magnetic layer on a support, grinds the surface of the magnetic layer, and brings a magnet into contact with the ground magnetic surface. The present invention provides a method of manufacturing a magnetic recording medium in close proximity to each other. In this case, the magnet body is preferably a magnet roll.
【０００８】次に本発明を詳細に説明する。本発明にお
いて、磁性層表面の研削は、ダイヤモンドホイールある
いは固定式ブレードその他の高硬度の研削具を走行する
磁性層表面に接触させることにより行うが、この研削は
磁性塗料を支持体に塗布・乾燥して磁性層を形成し、カ
レンダー処理を行った後行なうことが好ましい。このカ
レンダ処理を行った後は磁性層を形成した原反を巻き取
る前に行っても良く、巻き取った後これを巻き戻して別
の工程で行っても良い。Next, the present invention will be explained in detail. In the present invention, the surface of the magnetic layer is ground by bringing a diamond wheel, fixed blade, or other high-hardness grinding tool into contact with the surface of the traveling magnetic layer. It is preferable to carry out this after a magnetic layer is formed and calendering is carried out. After performing this calendering process, it may be performed before winding up the original fabric on which the magnetic layer is formed, or it may be performed after winding up, unwinding it and performing another process.
【０００９】また、本発明で用いる磁石体は、磁石ロー
ルが好ましい。この磁石ロールは回転自在に設けて、走
行する支持体の磁性層に接触させることによりその摩擦
で回転させても良く、強制的に回転させても良い。強制
的に回転させる場合は支持体の走行方向とは逆方向に回
転させることが好ましいが、正方向に回転させても良い
。また、強制回転の場合には支持体の磁性層に接触させ
ず、近接させても良い。磁石体の磁束密度としては１５
００〜５０００Ｇ（ガウス）が好ましい。[0009] Furthermore, the magnet body used in the present invention is preferably a magnet roll. This magnet roll may be rotatably provided and brought into contact with the magnetic layer of the running support to cause it to rotate by the friction, or it may be forced to rotate. When forced to rotate, it is preferable to rotate in the opposite direction to the running direction of the support, but it may also be rotated in the forward direction. In addition, in the case of forced rotation, the magnetic layer of the support may be brought close to the magnetic layer without contacting it. The magnetic flux density of the magnet is 15
00 to 5000G (Gauss) is preferable.
【００１０】本発明の磁気記録媒体の磁性層に使用され
るバインダーの成分として用いられる樹脂としては、例
えば塩化ビニル−酢酸ビニル共重合体、塩化ビニル−酢
酸ビニル共重合−ビニルアルコール共重合体、塩化ビニ
ル−酢酸ビニル−マレイン酸共重合体、塩化ビニル−塩
化ビニリデン共重合体、塩化ビニル−アクリロニトリル
共重合体、アクリル酸エステル−アクリロニトリル共重
合体、アクリル酸エステル−塩化ビニリデン共重合体、
メタクリル酸エステル−塩化ビニリデン共重合体、メタ
クリル酸エステル−スチレン共重合体、熱可塑性ポリウ
レタン樹脂、ポリフッ化ビニル、塩化ビニリデン−アク
リロニトリル共重合体、ブタジエン−アクリロニトリル
共重合体、アクリロニトリル−ブタジエン−メタクリル
酸共重合体、ポリアミド樹脂、ポリビニルブチラール、
セルロース誘導体、スチレン−ブダジエン共重合体、ポ
リエステル樹脂、ポリブタジエン等の合成ゴム等の樹脂
が挙げられる。Examples of the resin used as a component of the binder used in the magnetic layer of the magnetic recording medium of the present invention include vinyl chloride-vinyl acetate copolymer, vinyl chloride-vinyl acetate copolymer-vinyl alcohol copolymer, Vinyl chloride-vinyl acetate-maleic acid copolymer, vinyl chloride-vinylidene chloride copolymer, vinyl chloride-acrylonitrile copolymer, acrylic ester-acrylonitrile copolymer, acrylic ester-vinylidene chloride copolymer,
Methacrylic acid ester-vinylidene chloride copolymer, methacrylic acid ester-styrene copolymer, thermoplastic polyurethane resin, polyvinyl fluoride, vinylidene chloride-acrylonitrile copolymer, butadiene-acrylonitrile copolymer, acrylonitrile-butadiene-methacrylic acid copolymer Polymer, polyamide resin, polyvinyl butyral,
Examples include resins such as cellulose derivatives, styrene-butadiene copolymers, polyester resins, and synthetic rubbers such as polybutadiene.
【００１１】また、熱硬化性樹脂も用いられ、例えばフ
ェノール樹脂、エポキシ樹脂、熱硬化性ポリウレタン樹
脂、尿素樹脂、メラミン樹脂、アルキッド樹脂、尿素−
ホルムアルデヒド樹脂、シリコン樹脂、アクリル系反応
樹詣、エポキシ−ポリアミド樹脂、ニトロセルロース−
メラミン樹脂、高分子ポリエステル樹脂とイソシアネー
トプレポリマーの混合物、ポリエステルポリオールとポ
リイソシアネートの混合物、尿素ホルムアルデヒド樹脂
、低分子量のグリコール／高分子量ジオール／トリフェ
ニルメタントリイソシアネートの混合物、ポリアミン樹
脂及びこれらの混合物等が挙げられ、これらのうち強磁
性粉末に対する分散性の良いものを組み合わせて用いる
ことが好ましい。Thermosetting resins are also used, such as phenolic resins, epoxy resins, thermosetting polyurethane resins, urea resins, melamine resins, alkyd resins, and urea resins.
Formaldehyde resin, silicone resin, acrylic reaction resin, epoxy polyamide resin, nitrocellulose
Melamine resin, mixture of high molecular weight polyester resin and isocyanate prepolymer, mixture of polyester polyol and polyisocyanate, urea formaldehyde resin, mixture of low molecular weight glycol/high molecular weight diol/triphenylmethane triisocyanate, polyamine resin and mixtures thereof, etc. Of these, it is preferable to use a combination of those that have good dispersibility in ferromagnetic powder.
【００１２】また、磁性層に用いられる磁性粉としては
、γ−Ｆｅ２Ｏ３（ガンマ三二酸化鉄）、γ−Ｆｅ２Ｏ
３とＦｅ３Ｏ４（ガンマ三二酸化鉄と四三酸化鉄）の結
晶、ＣｒＯ２（二酸化クロム）、コバルトを被着したγ
−Ｆｅ２Ｏ３又はＦｅ３Ｏ４（ガンマ三二酸化鉄と四三
酸化鉄）などがあげられる。また、金属磁性粉、窒化金
属磁性粉、炭化金属磁性粉等の非酸化物系磁性粉も使用
でき、両方を併用することもできる。Further, as the magnetic powder used for the magnetic layer, γ-Fe2O3 (gamma iron sesquioxide), γ-Fe2O
3 and Fe3O4 (gamma triferric oxide and triferric tetroxide) crystals, CrO2 (chromium dioxide), and cobalt-coated γ
-Fe2O3 or Fe3O4 (gamma triferric oxide and triferric tetroxide), and the like. In addition, non-oxide magnetic powders such as metal magnetic powders, metal nitride magnetic powders, and metal carbide magnetic powders can also be used, and both can also be used in combination.
【００１３】上記バインダー用樹脂、磁性粉末のほかに
磁性塗料には有機溶剤も含まれ、この磁性塗料にはさら
に必要に応じて分散剤、研磨剤、充填剤、帯電防止剤、
防錆剤、防かび剤等の各成分が適宜選択混合される。そ
の製造方法としては公知の方法が用いられる。In addition to the binder resin and magnetic powder, the magnetic paint also contains an organic solvent, and the magnetic paint further contains a dispersant, an abrasive, a filler, an antistatic agent,
Each component such as a rust preventive agent and a fungicide is appropriately selected and mixed. A known method is used as the manufacturing method.
【００１４】この磁性塗料は例えばポリエチレンテレフ
タレートフィルム（ＰＥＴフィルム）等の支持体にドク
ターブレード、リバースロール、グラビアロール、スピ
ンナーコートなどの公知の塗布手段で塗布され、用途に
よって磁性粉を配向させて乾燥し、磁性層を形成する。
この後表面平滑処理を施しても良い。This magnetic paint is applied to a support such as a polyethylene terephthalate film (PET film) using a known coating method such as a doctor blade, reverse roll, gravure roll, or spinner coat, and the magnetic powder is oriented and dried depending on the application. Then, a magnetic layer is formed. After this, surface smoothing treatment may be performed.
【００１５】[0015]
【作用】研削具を用いて磁性層表面の脱落し易い粒子等
を除去するとともに、磁石体を接触又は近接させるので
、研削処理の際の削り屑等の残存する除去されない粒子
等は磁石体の磁気により吸い付けられて磁石体に付着し
て持ち去られる。[Operation] A grinding tool is used to remove particles that easily fall off on the surface of the magnetic layer, and the magnet bodies are brought into contact or close to each other, so particles that remain and are not removed, such as shavings during the grinding process, are removed from the magnet body. It is attracted by magnetism, attaches to a magnet, and is carried away.
【００１６】〔実施例〕次に本発明の実施例を説明する
。
実施例１
Ｃｏ含有γ−三二酸化鉄（Ｃｏ含有γ−Ｆｅ２Ｏ３
）（比表面積３５平方メートル／ｇ、Ｈｃ＝８５０エー
ルステッド） １００重量部
酸化アルミニウムＡｌ２Ｏ３（平均粒径０．２μｍ
） ５重量部 塩化ビニル酢酸ビニル共重合体
樹脂
１１重量部 ポリウレタン樹脂
１１重量部 ブチルス
テアレート
２
重量部 ステアリン酸
２重量部 カーボンブラック
（キャボット社製Ｖａｌｃａｎ ７２）
５重量部 メチルエチルケトン
１３０重量部
トルエン
１３０重量部[Example] Next, an example of the present invention will be described. Example 1 Co-containing γ-iron sesquioxide (Co-containing γ-Fe2O3
) (specific surface area 35 square meters/g, Hc = 850 Oersted) 100 parts by weight Aluminum oxide Al2O3 (average particle size 0.2 μm
) 5 parts by weight Vinyl chloride vinyl acetate copolymer resin
11 parts by weight polyurethane resin
11 parts by weight Butyl stearate
2
Parts by weight Stearic acid
2 parts by weight carbon black (Cabot Valcan 72)
5 parts by weight methyl ethyl ketone
130 parts by weight toluene
130 parts by weight
【００１７】以上の混合物をサンドミルにて５時間混合
し、得られた分散液に硬化剤（イソシアネート化合物）
を３重量部添加して磁性塗料を得た。この磁性塗料を１
４μｍの厚さのＰＥＴフィルム（ポリエチレンテレフタ
レートフィルム）上にグラビアコータにより乾燥後の膜
厚で４〜６μｍになるように塗布し、乾燥させる。この
後、カレンダー処理を行って磁性層を鏡面仕上げし、巻
き取った。The above mixture was mixed in a sand mill for 5 hours, and a curing agent (isocyanate compound) was added to the resulting dispersion.
A magnetic paint was obtained by adding 3 parts by weight of. 1 of this magnetic paint
It is coated onto a 4 μm thick PET film (polyethylene terephthalate film) using a gravure coater so that the film thickness after drying is 4 to 6 μm, and dried. Thereafter, the magnetic layer was subjected to a calender treatment to give a mirror finish, and then wound up.
【００１８】図１に示すように、この磁性層を形成した
原反の巻出しロール１より原反２をガイドロール３、３
・・・を介して３ ｍ／秒の速度で走行させて巻き取
りロール４に巻きとる。この間、ガイドロール３、３の
間に固定サファイヤブレード５を配置し、その鋭利な先
端を磁性層表面に接触させる。As shown in FIG. 1, the original fabric 2 is passed from the unwinding roll 1 on which the magnetic layer is formed to the guide rolls 3, 3.
. . , at a speed of 3 m/sec and wound onto a winding roll 4. During this time, a fixed sapphire blade 5 is placed between the guide rolls 3, 3, and its sharp tip is brought into contact with the surface of the magnetic layer.
【００１９】また、その直後のガイドロールと次のガイ
ドロールの間に磁石ロール６を配置する。この磁石ロー
ル６は、図２に示すように、２０００Ｇの磁性体からな
る円筒体７の両端にベアリングを用いた丸軸８が回転自
在に嵌挿されたもので、その円筒体表面が上記原反２の
磁性層に接触され、丸軸８が固定状態で支持されること
により円筒体７が原反２の走行とともに回転する。円筒
体７の表面メッキ層にはスクレーバ１２が接触して設け
られ、メッキ層に付着した付着物がかきとられる。なお
、１３はそのかきとったものの収容容器である。Furthermore, a magnet roll 6 is placed between the immediately following guide roll and the next guide roll. As shown in FIG. 2, this magnet roll 6 has a cylindrical body 7 made of a 2000G magnetic material and a round shaft 8 using bearings rotatably inserted into both ends of the cylindrical body 7, and the surface of the cylindrical body is The cylindrical body 7 is brought into contact with the opposite magnetic layer 2 and is supported in a fixed state by the round shaft 8, so that the cylindrical body 7 rotates as the web 2 travels. A scraper 12 is provided in contact with the surface plating layer of the cylindrical body 7 to scrape off deposits adhering to the plating layer. Note that 13 is a container for storing the scraped material.
【００２０】上記のように処理された原反を１／２イン
チ幅にスリットして磁気テープを作成し、その出力低下
、ドロップアウトを測定した結果を表１に示す。A magnetic tape was prepared by slitting the original fabric processed as described above into 1/2 inch width, and the output drop and dropout were measured. Table 1 shows the results.
【００２１】実施例２
磁石ロールの磁束密度を４０００Ｇにした以外は実施例
１と同様にして表面研削処理を行って磁気テープを作成
し、その出力低下、ドロップアウトを測定した結果を表
１に示す。Example 2 A magnetic tape was prepared by performing surface grinding treatment in the same manner as in Example 1 except that the magnetic flux density of the magnet roll was set to 4000G. Table 1 shows the results of measuring the output drop and dropout. show.
【００２２】比較例１
実施例１において、表面研削処理のみを行い、磁石ロー
ル処理を行わなかった以外は同様にして磁気テープを作
成し、その出力低下、ドロップアウトを測定した結果を
表１に示す。Comparative Example 1 A magnetic tape was prepared in the same manner as in Example 1 except that only the surface grinding treatment was performed and no magnet roll treatment was performed, and the results of measuring the output drop and dropout are shown in Table 1. show.
【００２３】[0023]
【表１】[Table 1]
【００２４】なお、出力低下、ドロップアウトの測定法
は以下の通りである。
出力低下：１／２インチ幅のテープを用い、室温にて６
０分画像を記録し、再生を１５回繰り返し、１回目の再
生出力と１５回目の再生出力の差を出力低下とした。
ドロップアウト：１／２インチ幅のテープを用い、１０
分間画像を記録し、再生時の１０μｓｅｃ、−１６ｄＢ
の大きさのドロップアウトを測定し、１分当たりの平均
に換算する。The method for measuring output drop and dropout is as follows. Output drop: 6 at room temperature using 1/2 inch wide tape.
A 0-minute image was recorded, and the playback was repeated 15 times, and the difference between the first playback output and the 15th playback output was defined as the output drop. Dropout: Using 1/2 inch wide tape, 10
Record images for minutes, play back 10μsec, -16dB
The dropout is measured and converted to an average per minute.
【００２５】[0025]
【発明の効果】本発明によれば、磁性層表面の研削処理
とともに、磁石ロールによる処理を行ったので、磁性層
表面の脱落し易いものは除かれ、表面の粒子は強固に固
着され表面も平滑になるので、磁気テープとして使用し
たときに粉落ち等による目詰まり、ドロップアウト、出
力低下等のことを著しく低くすることができる。[Effects of the Invention] According to the present invention, since the surface of the magnetic layer is ground and treated with a magnetic roll, particles on the surface of the magnetic layer that are likely to fall off are removed, particles on the surface are firmly fixed, and the surface is also Since it is smooth, when used as a magnetic tape, it is possible to significantly reduce clogging due to falling particles, dropouts, decrease in output, etc.
【図１】本発明の一実施例の概略工程図である。FIG. 1 is a schematic process diagram of an embodiment of the present invention.
【図２】上記実施例に用いる磁石ロールの説明図である
。FIG. 2 is an explanatory diagram of a magnet roll used in the above embodiment.
２ 磁性層形成済み原反 ５ 固定サファイヤブレード ６ 磁石ロール 2 Original fabric with magnetic layer formed 5 Fixed sapphire blade 6 Magnet roll
Claims (2)
層表面を研削し、この研削した磁性表面に磁石体を接触
又は近接させる磁気記録媒体の製造方法。1. A method for manufacturing a magnetic recording medium, which comprises forming a magnetic layer on a support, grinding the surface of the magnetic layer, and bringing a magnet into contact with or close to the ground magnetic surface.
載の磁気記録媒体の製造方法。2. The method for manufacturing a magnetic recording medium according to claim 1, wherein the magnet body is a magnet roll.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11709391A JPH04274023A (en) | 1991-02-28 | 1991-02-28 | Production of magnetic recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11709391A JPH04274023A (en) | 1991-02-28 | 1991-02-28 | Production of magnetic recording medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04274023A true JPH04274023A (en) | 1992-09-30 |
Family
ID=14703225
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11709391A Withdrawn JPH04274023A (en) | 1991-02-28 | 1991-02-28 | Production of magnetic recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04274023A (en) |
-
1991
- 1991-02-28 JP JP11709391A patent/JPH04274023A/en not_active Withdrawn
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Legal Events
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|---|---|---|---|
| A300 | Application deemed to be withdrawn because no request for examination was validly filed |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 19980514 |